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gerrit-public.fairphone.software / kernel / msm-5.4 / ba75bb98cfb93b62c54af25bf67ff90857264bbe / . / fs / ceph / mon_client.h
blob: 5258c5693b0350f65868f88ad42a91c7b2eddb61 [file] [log] [blame]
Sage Weilba75bb92009-10-06 11:31:11 -0700[diff] [blame^]1#ifndef _FS_CEPH_MON_CLIENT_H
2#define _FS_CEPH_MON_CLIENT_H
3
4#include <linux/completion.h>
5#include <linux/radix-tree.h>
6
7#include "messenger.h"
8#include "msgpool.h"
9
10struct ceph_client;
11struct ceph_mount_args;
12
13/*
14 * The monitor map enumerates the set of all monitors.
15 */
16struct ceph_monmap {
17 struct ceph_fsid fsid;
18 u32 epoch;
19 u32 num_mon;
20 struct ceph_entity_inst mon_inst[0];
21};
22
23struct ceph_mon_client;
24struct ceph_mon_statfs_request;
25
26
27/*
28 * Generic mechanism for resending monitor requests.
29 */
30typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
31 int newmon);
32
33/* a pending monitor request */
34struct ceph_mon_request {
35 struct ceph_mon_client *monc;
36 struct delayed_work delayed_work;
37 unsigned long delay;
38 ceph_monc_request_func_t do_request;
39};
40
41/*
42 * statfs() is done a bit differently because we need to get data back
43 * to the caller
44 */
45struct ceph_mon_statfs_request {
46 u64 tid;
47 int result;
48 struct ceph_statfs *buf;
49 struct completion completion;
50 unsigned long last_attempt, delay; /* jiffies */
51 struct ceph_msg *request; /* original request */
52};
53
54struct ceph_mon_client {
55 struct ceph_client *client;
56 struct ceph_monmap *monmap;
57
58 struct mutex mutex;
59 struct delayed_work delayed_work;
60
61 bool hunting;
62 int cur_mon; /* last monitor i contacted */
63 unsigned long sub_sent, sub_renew_after;
64 struct ceph_connection *con;
65
66 /* msg pools */
67 struct ceph_msgpool msgpool_mount_ack;
68 struct ceph_msgpool msgpool_subscribe_ack;
69 struct ceph_msgpool msgpool_statfs_reply;
70
71 /* pending statfs requests */
72 struct radix_tree_root statfs_request_tree;
73 int num_statfs_requests;
74 u64 last_tid;
75
76 /* mds/osd map or mount requests */
77 bool want_mount;
78 int want_next_osdmap; /* 1 = want, 2 = want+asked */
79 u32 have_osdmap, have_mdsmap;
80
81 struct dentry *debugfs_file;
82};
83
84extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
85extern int ceph_monmap_contains(struct ceph_monmap *m,
86 struct ceph_entity_addr *addr);
87
88extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
89extern void ceph_monc_stop(struct ceph_mon_client *monc);
90
91/*
92 * The model here is to indicate that we need a new map of at least
93 * epoch @want, and also call in when we receive a map. We will
94 * periodically rerequest the map from the monitor cluster until we
95 * get what we want.
96 */
97extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
98extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
99
100extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
101
102extern int ceph_monc_request_mount(struct ceph_mon_client *monc);
103
104extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
105 struct ceph_statfs *buf);
106
107
108
109#endif